| 词汇 | example_english_roll-up |
| 释义 | Examples of roll up!These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. The principal feature in the roll-up of the ligament is that the only stable configuration is that of a sphere. These data suggest that the growth of the instability and the resulting vortex roll-up is considerably stronger in the circular jet. The calculation proceeds smoothly until roll-up begins; inevitably the sheet crosses itself. To obtain a regular roll-up the vortices are uniformly spaced and given a sinusoidal perturbation of the appropriate wavelength. The result is the roll-up of the shear layer into vortical lumps one wavelength apart, connected by thin braids. In actual physical flows, a nonlinear roll-up of the vortex sheets occurs and the wake configuration is not known in advance. Both the roll-up and the coalescence of the vortices take place in a region, not at a single point. These data show that both the vortices accelerate after roll-up, then vortex 1 continues to accelerate but vortex 2 starts decelerating. The motion of the point vortices becomes chaotic in the region of the vortex sheet roll-up. This difference between the maximally unstable and the natural roll-up frequencies is being further investigated in our laboratory. We include in figure 2 a sequence of pictures showing the initial regular stages of roll-up of a vortex sheet. Two plateaus, one at the roll-up region and the other at the vortex merging region, existed. The apparent 'roll-up' of the streaklines is followed by their distortion and segregation during impingement upon the edge. It is available in a roll-up stick form. The roll-up of the shear layer is a mechanism for accumulation of vorticity in lumps. The roll-up, pairing, and passage of paired vortices even under the excitation is not exactly periodic in space and time. If no energy is lost during roll-up, the shape of each vortex is given above. The mechanism for the spot formation appears to be the generation of a pressure pulse by the spark and an associated nearly axisymmetric shear-layer roll-up. First, roll-up of a vortex sheet probably will not result in uniform vortices, so the results may be taken only as a crude estimate of the size of vortices produced. They applied their method to the roll-up of a vortex sheet shed by an elliptically loaded wing, but included a singlevortex representation for the inner region of the spiral. The use of constant vorticity centres to represent the pattern assumes that vorticity has diffused in the region of the roll-up, giving a uniform blob of vorticity. If the circulation is reduced below some threshold level in the formation region, the mutual attraction between the opposing shear layers will be too weak to form the vortex roll-up. However, it might be possible to choose a path to get around the singularity in the complex-time plane, along which we define the smooth roll-up solution by analytic continuation. This, of course, does not come as a surprise, since the elliptic vortex sheet distribution leads to a rather concentrated vorticity distribution, once roll-up is completed. It would allow the limited carrying forward of dividend, otherwise known as roll-up, in pools competitions. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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